docs: def _bytes_to_human(self, B):
          ''' Return the given bytes as a human friendly KB, MB, GB, or TB string '''
          KB = float(1024)
          MB = float(KB ** 2) # 1,048,576
          GB = float(KB ** 3) # 1,073,741,824
          TB = float(KB ** 4) # 1,099,511,627,776
  
          if B < KB:
              return '{0} B'.format(B)
          B = float(B)
          if KB <= B < MB:
              return '{0:.2f} KB'.format(B/KB)
          elif MB <= B < GB:
              return '{0:.2f} MB'.format(B/MB)
          elif GB <= B < TB:
              return '{0:.2f} GB'.format(B/GB)
          elif TB <= B:
              return '{0:.2f} TB'.format(B/TB)